c# - how to read from port and write an exe file without coruption

Question

I am using AT commands and downloading a file using FTP . We have everything working until we send RETR a.exe .

The file data is also sent on the port. But it contains the response headers like RECEIVE:1,1400 , 150 connection accepted etc. How do we write this file so that we will have a uncorrupted a.exe which will run on the client device. Please advise. We are using C#. Should we remove the headers. How do we do it . Get a good exe file ?

Thanks